Edwards (757-4A-T) 75cdw, 60cdc strobe, horn 97 dba avg., red

The Edwards 757-4A-T is a 75-candela temporal horn-strobe in red, part of the Integrity 757 Series. Specifically, the horn produces a sharp temporal-three (T3) pattern for evacuation signaling. As a result, you get a combined audible and visible notification appliance in one compact wall-mount unit.

First, the device combines a high-efficiency horn with a xenon strobe. Then a single mounting plate holds it against a standard North-American two-gang electrical box. Therefore, installation is fast and consistent across diverse building types.

Horn Output and Tone Selection

Furthermore, the horn is field-configurable for temporal-three or continuous output, and for HIGH (98 dBA) or LOW (94 dBA) volume. As a result, the installer can match the appliance to the building’s acoustic environment without swapping hardware.

Specifically, the verified horn-strobe sound output (UL 464 method) is:

• HIGH temporal: 97 dBA peak / 79 dBA reverberant average
• HIGH continuous: 97 dBA peak / 85 dBA reverberant average
• LOW temporal: 93 dBA peak / 75 dBA reverberant average
• LOW continuous: 93 dBA peak / 79 dBA reverberant average

UL 1971 and UL 1638 Strobe Ratings

Also, the integrated strobe is UL 1971-listed at 75 cd wall mount and 60 cd ceiling mount. In addition, it is UL 1638-listed at 75 cd as a protective visual signaling appliance. Therefore, the device qualifies for both public-mode life-safety and private-mode protective signaling use cases.

Furthermore, the strobe is rated 48 cd @ -35°C per UL (and @ -40°C per ULC) for outdoor cold-weather operation. As a result, the device retains effective output across the temperature range when paired with a 757A-WB weatherproof box.

Self-Synchronized Temporal Pattern

Specifically, when temporal output is selected, all 757-4A-T horns on a common two-wire circuit are self-synchronized within 200 milliseconds. Therefore, an external sync module is not required for audible synchronization. However, an external sync module IS still required to meet UL 1971’s 10-millisecond strobe synchronization requirement (sources include G1M-RM, SIGA-CC1S, SIGA-MCC1S, BPS6A, BPS10A).

Verified Specifications

• Strobe rating (wall): 75 cd (UL 1971)
• Strobe rating (ceiling): 60 cd (UL 1971)
• UL 1638 / ULC S526 rating: 75 cd
• Operating voltage: 16–33 VDC or Vfwr continuous (strobe AND horn)
• Strobe typical current: 159 mA @ 24 VDC / 263 mA @ 16 VDC RMS UL
• Horn current (HIGH): 40 mA @ 24 VDC / 55 mA @ 24 Vrms FWR
• Horn current (LOW): 20 mA @ 24 VDC / 28 mA @ 24 Vrms FWR
• Flash rate: 1 fps synchronized (with external sync source)
• Housing: Textured, color-impregnated engineered plastic (exceeds UL 94V-0)
• Color: Red (white version is 757-4A-TW)
• Lens: Clear LEXAN; ships with LKW-1 “FIRE” wall-mount markings
• Wire connections: Separate polarized terminals for horn and strobe, #12 AWG (2.5 mm²) max
• Operating environment (indoor): 32–120°F (0–49°C), 93% RH @ 40°C
• Operating environment (outdoor, w/ 757A-WB): -31 to 150°F (-35 to 66°C), 98% RH @ 40°C
• Cold-weather strobe output: 48 cd @ -35°C UL / -40°C ULC
• Listings: UL 1971, UL 1638, UL 464, ULC S526, ULC S525, MEA, CSFM, FM
• ADA compliant (Code of Federal Regulation Chapter 28 Part 36 Final Rule)

Mounting

Specifically, the 757-4A-T flush-mounts to a standard North-American two-gang electrical box, 2¾ inches (69 mm) minimum depth. Therefore, no separate trim plate is required. Also, surface and weatherproof mounting use Edwards’s color-matched accessory boxes:

• 757A-SB — indoor surface box, red
• 757A-WB — weatherproof outdoor surface box, red
• 757A-BDF — bi-directional mounting frame, red

Lens Markings

However, the unit ships with “FIRE” wall-orientation markings. Therefore, ceiling-mount or alternate-language installations need an LKW or LKC lens kit (e.g., LKC-1 for ceiling “FIRE”, LKW-2 for “FEU”, LKW-3 for bilingual “FIRE/FEU”, LKW-4 for “SMOKE”, LKW-7 for “EMERGENCY”).

Order the Edwards 757-4A-T

To order the Edwards 757-4A-T, call 1-888-557-0558. Alternatively, email sales@lifesafetycom.com.

For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com